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Table 1
Summary of the Keck/LRIS observations.
| Object | Exp. time | Filter | Seeing | Airmass |
| (s) | (″) | |||
|
|
||||
| SDSS J0827+5224 | 600 | B | 0.81 | 1.39 |
| 600 | R | 0.90 | 1.39 | |
| 600 | G400 red | 1.20 | 1.19 | |
| 600 | G600 blue | 1.20 | 1.19 | |
| SDSS J0919+2720 | 600 | B | 0.75 | 1.13 |
| 600 | R | 0.75 | 1.13 | |
| 900 | G400 red | 1.20 | 1.01 | |
| 900 | G600 blue | 1.20 | 1.01 | |
| SDSS J1005+4016 | 600 | B | 0.75 | 1.12 |
| 600 | R | 0.70 | 1.12 | |
| 1200 | G400 red | 1.20 | 1.07 | |
| 1240 | G600 blue | 1.20 | 1.07 | |
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